Surface scale is the oxide layer formed on high-strength structural steel plates during hot rolling or heat treatment processes.
Surface scale refers to the iron oxide layer that develops on the surface of high-strength structural steel plates when exposed to elevated temperatures during manufacturing processes such as hot rolling, forging, or heat treatment. This layer typically consists of FeO, Fe3O4, and Fe2O3 oxides in varying proportions, depending on temperature and atmospheric conditions. The scale formation is an inevitable byproduct of steel processing and must be carefully controlled and removed to ensure proper surface quality for subsequent operations like welding, painting, or coating.
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Scale removal is critical because the oxide layer can interfere with welding quality, reduce paint adhesion, cause surface defects in finished products, and accelerate corrosion if not properly addressed.
Common methods include mechanical descaling (shot blasting, grinding), chemical pickling (acid baths), and high-pressure water jetting. The choice depends on plate thickness, scale characteristics, and subsequent processing requirements.
While the scale itself has minimal effect on bulk mechanical properties, improper scale removal can lead to surface defects that reduce fatigue resistance and promote stress concentration points.
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